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by Killertechno
Wed Jul 03, 2013 6:56 am
Forum: Troubleshooting
Topic: Network connection manager
Replies: 6
Views: 1708

Re: Network connection manager

Hi, I'm having several problems with Sakis3G (I suppose): I correctly connecto to internet, but as soon I start to download (dowbload speed uo to 400Kbps), connection goes down.
Is there a way to understand why?
Is there other software except Sakis3G to use?
Thanks.
by Killertechno
Wed May 29, 2013 12:54 pm
Forum: Advanced users
Topic: GPRS usb modem, Huawei E171
Replies: 12
Views: 18530

Re: GPRS usb modem, Huawei E171

Thanks, I had similar problem wit 3G modem ONDA MDW655. After installed usb-modeswitch I always had device configured as USB disk at boot, so I always need to reboot rasp to find device automatically configured as USB modem. Or should I unplug-plug USB device to start automatic conversion. Whit foll...
by Killertechno
Thu May 09, 2013 7:40 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Re: Square wave unstable: GPIO or timing troubles?

I need signal to synchronize external hardware, output signal should have from 100 to 2000-2500 Hz. I need to use PPS output from GPS (I've seen there are a couple of posts about sync NTP time to GPS), when not available GPS I would use standard NTP. At the same time I would use as possible only Ras...
by Killertechno
Wed May 08, 2013 2:20 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Re: Square wave unstable: GPIO or timing troubles?

Do you know PPS output of GPS modules?
It works at 1 HZ, I need to make same thing, working at 2000 Hz, but this time synchronized with NTP time.
My rasp will work as a "GPS-PPS source".

I've tried to work without GUI, same result.
by Killertechno
Wed May 08, 2013 7:17 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Re: Square wave unstable: GPIO or timing troubles?

Unfortunately that's done through PWM, my aim is to make a 2KHz wave synchronized with internal time (like PPS output).
by Killertechno
Mon May 06, 2013 7:48 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Re: Square wave unstable: GPIO or timing troubles?

If the trouble is due the GUI it would be hard, I'll need to use GUI....
Ok, I'll try without GUI (actually I'm using Raspbian, I hope trying with ARCH GUI it'll be better).
Thanks.
by Killertechno
Mon May 06, 2013 7:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Re: Square wave unstable: GPIO or timing troubles?

I'm using GUI (X), ethernet disconnected (could this be a problem? I would need ethernet connected on the future).
Then I use USB hub for keyboard and mouse.
by Killertechno
Mon May 06, 2013 6:54 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Square wave unstable: GPIO or timing troubles?
Replies: 17
Views: 5023

Square wave unstable: GPIO or timing troubles?

I'm trying to make a square wave using GPIO pin. I've followed this: http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/ I used same example code: - C: Maximum performance - BCM2835 C library I also used Getsystemclock (I get time then I wait until difference time is what I need,...
by Killertechno
Mon Apr 29, 2013 3:33 pm
Forum: C/C++
Topic: Writing own device driver
Replies: 4
Views: 3950

Re: Writing own device driver

Hi, is there a tutorial (or similar) about writing driverso for Raspberry? I would like to make my own (I know this feature is already available, but I would make it by myself) timing system: PPS output on GPIO, I sync time through NTP, if not available GPS receiver connected. How can I use hardware...
by Killertechno
Fri Apr 26, 2013 9:50 am
Forum: C/C++
Topic: Build kernel modules against running kernel
Replies: 7
Views: 5156

Re: Build kernel modules against running kernel

I apologize, but I'm a very noob..... I can't understand: I can find default libraries to control GPIO signals on GPIO Raspberry connector. Let's suppose are available on connector GPIO from 0 to 10, but only GPIO 0 to 5 are available from default GPIO libraries. Now I would allow to access "someway...
by Killertechno
Thu Apr 25, 2013 3:43 pm
Forum: General programming discussion
Topic: Read data at 2KHz sample rate, how to?
Replies: 3
Views: 1756

Re: Read data at 2KHz sample rate, how to?

I'm testing SPI libraries (I suppose GPIO libraries in C language, I don't remember), I can reach 3 KHz of sample rate. In high level language (Visual Basic) I can make a software timer interrupt that generates a call, could I make something similar in C/Phyton? I have to synchronize data collecting...
by Killertechno
Thu Apr 25, 2013 2:47 pm
Forum: General programming discussion
Topic: Read data at 2KHz sample rate, how to?
Replies: 3
Views: 1756

Read data at 2KHz sample rate, how to?

Hi, I don't know if it's the correct place to post, if not I apologize.... I need to intarface to an SPI device (vibration sensor) that uses SPI interface, it sends out data at 2000 Hz, every time I have to read 6 Bytes. I need to collect data ro make a real-time monitor, data would be displayed on ...
by Killertechno
Tue Apr 23, 2013 4:23 pm
Forum: General discussion
Topic: Similar to Raspberry Pi?
Replies: 1
Views: 596

Similar to Raspberry Pi?

Except the price, is this similar to Raspberry Pi?
http://www.embeddedarm.com/products/boa ... t=TS-4200#

If I'm not wrong it's the same Debian of Raspberry, isn't it?
by Killertechno
Fri Jan 25, 2013 9:36 am
Forum: Italiano
Topic: Che Temperatura ha il vostro Soc Broadcom?
Replies: 15
Views: 14547

Re: Che Temperatura ha il vostro Soc Broadcom?

Il mio ha CPU al 100% per trasferimento dati via seriale che vengono salvati su SD. Temperatura media sui 43 gradi, senza case, con temperatura ambiente sui 20-23 gradi. è comunque progettato per resistere fino a 85°C una temperatura di 40-50 gradi è più che normale, abbassarla ulteriormente non ha ...
by Killertechno
Thu Jan 24, 2013 4:55 pm
Forum: Other projects
Topic: HDMI converter for low cost display?
Replies: 0
Views: 630

HDMI converter for low cost display?

Maybe anyone more expert about Raspberry could say if I'm wrong or I'm right..... Raspberry comes with HDMI video output, what about convert this output to drive cheap LCD displays (for example 3,2" 240x320)? Here an HDMI to VGA converter http://www.analog.com/static/imported-files/circuit_notes/CN0...
by Killertechno
Tue Jan 22, 2013 3:11 pm
Forum: Graphics, sound and multimedia
Topic: Default display parameters for DSI
Replies: 27
Views: 16253

Re: Default display parameters for DSI

Ok, but all this supposing to use an external display with DSI interface instead hdmi or rca monitor.
But, for custom use, is there available a way to control S2 signals?
by Killertechno
Wed Jan 02, 2013 11:46 am
Forum: General discussion
Topic: Ultra low power mode?
Replies: 6
Views: 4816

Re: Ultra low power mode?

Get a bigger battery. Perhaps other boards may be better suited to your application Of course, I don't want make Raspberry "lowest power board" in the world. But I have a Raspberry and I access to it only through serial console (I don't use any graphic interface as RCA monitor or HDMI). How could I...

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